| Most common failures | No# failures |
|---|
| Headlamp aim out of alignment | 174 |
| Drive chain excessively loose |6.2.1d| | 54 |
| Rear Roller brake test indicates excessive fluctuation of brake effort |3.3.A1d| | 47 |
| Front Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 42 |
| Steering movement excessively `notchy` with the wheel raised |2.2.1b| | 37 |
| Rear Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 33 |
| Front position lamp does not illuminate immediately when switched on |1.1.3a| | 31 |
| Nearside Front shock absorber seal failed and leaking oil |2.3.3| | 30 |
| Drive chain worn to excess |6.2.1e| | 29 |
| Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 27 |
| Throttle operating incorrectly |6.2.1f| | 26 |
| Rear position lamp does not illuminate immediately when it is switched on |1.1.3a| | 25 |
| Horn not working |1.7.3a| | 23 |
| Offside Front shock absorber seal failed and leaking oil |2.3.3| | 23 |
| Steering movement excessively `notchy` with the weight on the lower bearing |2.2.1a| | 20 |
| Drive chain sprocket carrier worn to excess |6.2.1e| | 20 |
| Rear Drive chain sprocket worn to excess |6.2.1e| | 20 |
| Rear wheel bearings have excessive free play |2.4.A.2c| | 20 |
| Front Roller brake test indicates a binding brake |3.3.A1a| | 16 |
| Steering headbearing has excessive free play |2.2.2| | 15 |
| Wheel alignment incorrect which adversely affects the handling |2.5.1| | 14 |
| Headlamp aim beam image kick up to the offside |1.6| | 13 |
| Rear Roller brake test indicates a binding brake |3.3.A1a| | 12 |
| Headlamp at least one does not illuminate on dipped beam |1.2.2a|i|| | 12 |
| Drive chain excessively tight |6.2.1d| | 12 |
| Front wheel bearings have excessive free play |2.3.5b| | 12 |
| Rear Roller brake test indicates a sticking brake |3.3.A1a| | 11 |
| Rear suspension movement is excessively stiff |2.4.A.3b| | 11 |
| Rear Drive chain sprocket carrier worn to excess |6.2.1e| | 11 |
| Nearside Rear Direction indicator not working |1.5.1c| | 11 |
| Rear Brake pedal has inadequate reserve travel |3.1.3b| | 10 |
| Stop lamp remains on when the brake is released |1.3.1e| | 10 |
| Registration plate issues | 10 |
| Nearside Handlebar handgrip not secure to handlebars. |2.1.1c| | 10 |
| Roller brake test The less effective brake control does not achieve an efficiency of 25%. |3.3.A2b| | 9 |
| Offside Front Direction indicator not working |1.5.1c| | 9 |
| Exhaust is leaking and excessively noisey |7.1.1b| | 9 |
| Front shock absorber seal failed and leaking oil |2.3.3| | 9 |
| Rear Stop lamp remains on when the brake is released |1.3.1e| | 8 |
| Handlebar deformed |2.1.1b| | 8 |
| Brake pedal has inadequate reserve travel |3.1.3b| | 8 |
| Rear Roller brake test indicates a severely grabbing brake |3.3.A1b| | 7 |
| Rear Brake indicates excessive fluctuation of brake effort (1.2.1 (e)) | 7 |
| Headlamp insecure |1.2.3b| | 7 |
| Front Brake lever has inadequate reserve travel |3.1.3b| | 7 |
| Front Brake lever cannot be applied smoothly |3.1.3d| | 7 |
| Offside Handlebar handgrip not secure to handlebars. |2.1.1c| | 7 |
| Nearside Front Front shock absorber seal failed and leaking oil |2.3.3| | 6 |
| Front Hydraulic brake control feels spongy |3.1.4a| | 6 |
| Front Position lamp not working (4.2.1 (a)) | 6 |
| Rear Roller brake test indicates a severely juddering brake |3.3.A1b| | 6 |
| Roller brake test The less effective brake control does not achieve an efficiency of 25% (1.2.2 (a) (i)) | 6 |
| Rear Drive chain excessively loose |6.2.1d| | 6 |
| Front Floor brake test indicates a binding brake |3.3.C2c| | 6 |
| Headlamp at least one does not illuminate on main beam |1.2.2a|ii|| | 6 |
| Wheel alignment incorrect which adversely affects the steering |2.5.1| | 6 |
| Brake lever has inadequate reserve travel |3.1.3b| | 6 |
| Locking device|s| not correctly fitted which may make the motor bicycle dangerous to ride |6.2.1h| | 6 |
| Rear Valve stem seriously damaged (5.2.3 (j)) | 6 |
| Rear wheel spindle securing nut locking device missing |2.4.A.2b| | 6 |
| Front Brake disc|s| excessively worn |3.2.A1l| | 6 |
| Offside Front Front shock absorber seal failed and leaking oil |2.3.3| | 5 |
| Front Stop lamp not working (4.3.1 (a) (ii)) | 5 |
| Nearside Front Direction indicators not working |1.5.1c| | 5 |
| Throttle has a significant change in engine speed whilst moving the steering from lock to lock |2.1.4| | 5 |
| Front Drive chain sprocket worn to excess |6.2.1e| | 5 |
| Rear Rear wheel bearings have excessive free play |2.4.A.2c| | 5 |
| Direction indicators flashing more than 120 times per minute |1.5.1c| | 5 |
| Rear Drive chain worn to excess |6.2.1e| | 5 |
| Indicator switch insecure |1.5.4| | 5 |
| Offside Rear Footrest insecure |6.2.1a| | 5 |
| Drive chain excessively loose |6.1.7 |c| |i|| | 5 |
| Front Roller brake test indicates excessive fluctuation of brake effort |3.3.A1d| | 5 |
| Rear Brake indicates excessive fluctuation of brake effort |1.2.1 |e|| | 4 |
| Rear Brake pedal has insufficient reserve travel (1.1.2 (a)) | 4 |
| Rear Rear position lamp does not illuminate immediately when it is switched on |1.1.3a| | 4 |
| Rear reflector on motorcycle missing |1.4.1| | 4 |
| Rear shock absorber has inadequate damping effect. |2.4.A.3b| | 4 |
| Steering headbearing excessively stiff or notchy (2.2.2 (f) (i)) | 4 |
| Front Headlamp at least one does not illuminate on dipped beam |1.2.2a|i|| | 4 |
| Offside Front shock absorber seal failed and leaking oil (2.3.3) | 4 |
| Nearside Front Direction indicator not working |1.5.1c| | 4 |
| Offside Rear Direction indicator not working |1.5.1c| | 4 |
| Brake pedal cannot be released smoothly |3.1.3d| | 4 |
| Front Steering movement excessively `notchy` with the weight on the lower bearing |2.2.1a| | 4 |
| Offside Front Shock absorber has a serious fluid leak (5.3.2 (b)) | 4 |
| Nearside Front Shock absorber has a serious fluid leak (5.3.2 (b)) | 4 |
| Exhaust mounting does not fully support the exhaust system |7.1.1.c| | 4 |
| Rear Footrest missing |6.2.1a| | 3 |
| Front Brake disc significantly and obviously worn (1.1.14 (a) (i)) | 3 |
| Rear Position lamp not working (4.2.1 (a)) | 3 |
| Stop lamp remains on when the brakes are released | 3 |
| Rear wheel bearings are excessively rough |2.4.A.2c| | 3 |
| Front Front position lamp does not illuminate immediately when switched on |1.1.3a| | 3 |
| Handlebar mounting clamp bolt loose |2.1.1a| | 3 |
| Rear Brake reaction bracket insecure |3.2.A1j| | 3 |
| Rear Roller brake test indicates brake effort rise disproportional to brake lever or pedal effort |3.3.A1c| | 3 |
| Headlamp not working on dipped beam (4.1.1 (a) (ii)) | 3 |
| Rear Wheel has an excessively distorted bead rim. |4.2.2| | 3 |
| Rear Rear wheel spindle securing nut locking device missing |2.4.A.2b| | 3 |
| Drive chain worn to excess |6.1.7 |c| |i|| | 3 |
| Nearside Rear Direction indicators not working |1.5.1c| | 3 |
| Front wheel spindle securing nut|s| loose |2.3.3a| | 3 |
| Locking devices not correctly fitted which may make the motor bicycle dangerous to ride |6.2.1h| | 3 |
| Direction indicators not working |1.5.1c| | 3 |
| Steering movement excessively stiff with the wheel raised |2.2.1b| | 3 |
| Nearside Front Direction indicator damaged and function impaired |1.5.3a| | 3 |
| Exhaust excessively deteriorated |7.1.1a| | 3 |
| Rear Brake excessively binding |1.2.1 |f|| | 3 |
| Drive chain so loose it is likely to fail |6.1.7 |c| |ii|| | 3 |
| Front Steering movement excessively `notchy` with the wheel raised |2.2.1b| | 3 |
| Front Horn not working |1.7.3a| | 3 |
| Exhaust has a major leak of exhaust gases (6.1.2 (a)) | 3 |
| Stop lamp not working (4.3.1 (a) (ii)) | 3 |
| Offside Front Direction indicator not working (4.4.1 (a) (ii)) | 3 |
| Brake locking device missing |3.2.A1e| | 3 |
| Brake lever cannot be applied smoothly |3.1.3d| | 3 |
| Front Front wheel bearings have excessive free play |2.3.5b| | 3 |
| Front Headlamp at least one does not illuminate on main beam |1.2.2a|ii|| | 3 |
| Centre Rear Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 3 |
| Headlamp aim headlamp damaged and function impaired |1.2.3a| | 3 |